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W. STANLY, Jr. & J. I'. KELLY. ALTEENATING GUEEENT GENERATOR.

No. 499,446. Patented June 13, 1893.

L meats e6: mq u [$525015 @Mm/fffh a/mu u2/aw" 4 Mae@ UNITED STATES PATENT OFFICE VILLIAM STANLY, JR., AND JOHN F. KELLY, OF PITTSFIELD, MASSACHU- SETTS, ASSIGNORS TO THE STANLEY LABORATORY COMPANY, OF SAME PLACE.

ALTERNATINGFCURRENT GENERATOR.

SPECIFICATION forming part of Letters Patent No. 499,446, dated June 13, 1893.

Application tiled January 9, 1893. Serial No. 457,707. (No model.)

To all whom, t may concern:

Be itknown that we, WILLIAM STANLY, J r., and JOHN F. KELLY, citizens of the United Stat-es, residing at Pittsfield, in the county of Berkshire and State of Massachusetts, have invented certain newand useful Improvements in Alternating-Current Generators, ot` which the following is a specification, reference being had to the drawings accompanying and forming a part of the same.

Our present invention is an improvement in alternating current generators, and has for its objects to provide a better and more economical mechanical construction of such machines and to increase their effective out-put.

le have illustrated our invention as applied to a well understood type of machine designed to produce two currents of differing phase, but the applicability ot the improvements to the ordinary or single circuit generators is obvious.

In the accompanying drawings Figure l is a central vertical longitudinal section ot our improved alternator. Fig. 2 is an end View of the same with a portion of the end plate or f rame removed.

One portion of the machine is composed of two annular castings A fitted together. To opposite sides of these are clamped the circular end plates B B by bolts C, that serve also to bind together the two parts or sections of the ring. These parts constitute the stationary frame for the machine, and are suitably mounted on supports D D, forming part of the annular castings.

The end plates B B are formed with suitable journal boxes E, in which are the bearings of any proper description for a shaft F that carries an iron or steel core G, that constitutes the rotary element of the machine.

To the outer or sectional ringA are secured two polar extensions H H, composed of thin annular plates constituting laminated rings and bound together by bolts or other suitable means.

The core G is provided with polar extensions K which are preferably laminated. These polar extensions may be wider than shown, even to the extent of forming ribs across the core G, and it is also obvious that,

to a certain extent, the core G serves merely as a carrier or such a support as an ordinary spider, but it may be observed that the use of a spider would be objectionable on account of a greater magnetic leakage.

L is the energizing coil. This may be placed either between the polar extensions K, in which case sliding contacts would be required to maintain it in circuit, or in a recess provided for it in the annulus A between the polar extensions H. The effect ot this coil is to establish a magnetic circuit th rough the polar extensions H, K, and through the intermediate portions of the annulus Aand cylinder G, respectively, and across air spaces between the laminated rings H and K. In the rings H are transverse recesses for the reception of the induced coils P, S, while the plates vof the rings K are stamped or punched ont in such shape that when assembled they will present a series of poles, the width of the faces of which is about equal to the distance between the centers ot any two adjacent recesses in the ring Il, which contain the coils of one circuit, so that in the present machine, which has two induced circuits in quadrature, the poles of the rotating element, when just approaching or leaving the coils of one circuit, are central with respect to the coils of the other.

Under the conditions secured by the above described constructions, and when the machine is in operation, the coil L being connected with a sourcegof continuous current and the coils P, S, being' connected up in the usual manner, there will be a variation in the magnetic field or lines ot torce through the coils P, S, but there will be no change of flux in the magnetic circuit. In order that the magnetic variations that produce the currents may not be too abrupt, and so that the waves of the two currents may have the sinusoidal form which is the most desirable in practice, the faces of the poles K instead of being concentric with the faces of the outer ring H approximate in form the inverse of a sinusoidal curve. This varies the clearance between the two polar faces and generates currents of more gradually rising and falling potential.

IOO

It will be observed that the generator described is not only compact but is mechanically designed with a view of obtaining the greatest possible simplicity in construction and design. All the parts maybe cast or punched out and finished in an ordinary lathe. It thus becomes an easy matter to center all the parts.

' Vhat we claim is- 1. In an alternating current generator, the combination of a rotary core or support having outwardly projecting poles, a stationary magnetic annulus having corresponding and inwardly projecting polar extensions, an en` ergizing coil secured between the polar extensions, and stationary induced coils, portions ot' which are contained in transverse recessesin the said polar exten sions, as set forth.

2. In an alternating current generator, the combination with a rotary magnetic core, and laminated rings formed with polar projections secured tol the same, of a surrounding stationary annular casting, laminated rings secured to its inner face in positions corresponding to those on the rotary cylinder, an ener gizing coil in a space between the laminated nular magnetic element or part of the generator, the induced coils on the polar extensions H, and the energizing coil between such extcnsif as, of the rotary core having two correspending rows of poles K, the faces of which are cut down so that their clearance is increased from their centers to their edges or sides.

4. In an alternating current generator, the combination with an annular core, and a concentrically mounted cylindrical core with radiating poles at the ends, of an energizing coil in a central circumferential recess in the inner face of the annular core, and induced coils exposed to the variations ot' magnetic strength caused by the rotation ot' the cylindrical core, as set forth. l

WILLIAM STANLY, .T-R. JOHN F. KELLY. Witnesses:

WILLIAM B. TonEY, ERNEST B. CASTLE. 

